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Hadley's quadrant, 12 inch with back sight, early 19th century

Hadley's quadrant, 12 inch with back sight, early 19th century
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Largest available format 2480 × 3508 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 2480 × 3508 px 210 × 297 mm 921 KB
Medium 724 × 1024 px 61 × 87 mm 890 KB

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IMAGE number
UIS5101125
Image title
Hadley's quadrant, 12 inch with back sight, early 19th century
Auto-translated text View Original Source
Location
Science Museum, London, UK
Medium
object
Image description

Hadley's quadrant, 12 inch with back sight, early 19th century. Navigational instrument made by Spencer, Browning and Rust. In 1716, John Hadley (1682-1744) became a Fellow of the Royal Society and was appointed vice-president in 1728. In 1730, he invented a quadrant which worked on a double-reflecting principle allowing an accurate measurement of the altitude of stars and the Sun. This instrument was the precursor of the sextant. ©SSPL/Science Museum

Photo credit
SSPL/UIG / Bridgeman Images
Image keywords
19th century

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